Banded iron formations: Oceans, algae and iron oxide
Iron ore is rock rich in iron oxides (Fe 2 O 3) and includes minerals such as hematite and magnetite. Most of the world's ...
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The heavy metal rock bands charting life on early Earth
The waves of colourful rock within the specimen are made up of black and red bands of iron oxide (mostly haematite and some magnetite), interspersed with lighter sedimentary rock (silica). Scientists ...
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Some microbes used poison gas in battle for iron in the Earth's early oceans, geomicrobiologists find
huge rock deposits of iron show that microbes were oxidizing it effectively even then. "Before there was oxygen on Earth, phototrophic iron oxidizers formed the huge iron oxide deposits known ...
A Californian collector bought a rock in Morocco in 2011 and more than a decade later it turns out to be a much more valuable material
When you find a strange looking rock in the desert, it’s likely worth having some experts take a proper look at it, just like in this case.
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Earth's oxygen levels
Rocks containing iron oxide can only form if oxygen is present. Dating these rocks gives scientists evidence of when oxygen first built up in the atmosphere. Fossils Life processes can change the ...